WONDER #1821: Why Do Drink Lids Have Extra Holes?
Question 1 of 3
The second, tiny hole in plastic coffee cup lids allows liquids to flow more smoothly through the large hole because it allows what to enter the cup?
Question 2 of 3
In addition to allowing air to enter a cup, the second, tiny hole in plastic coffee cup lids also allows what to escape from inside the cup?
Question 3 of 3
During which decade were great strides made in coffee cup lid design?
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